Dynamo-electric machine



(No Model.) 2 Sheets-Sheet 1.

P. P. LOOMIS.

DYNAMO ELEGTRIU MAOEINE. No. 395,157. Patented Dec. 25, 1888.

(No Model.) 2 Sheets-Sheet 2. P. P. LOOMIS.

- DYNAMO ELEGTRIG MAOHINE.

No. 395,157. Patented Dec. 25, 1888.

a l. l

UNITED STATES PATENT @r rce.

FRANK F. LOOMIS, ()F AKRON, OlllO.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 395,157, dated December 25, 1888. Application filed October 30, 1886. ficrial No. 217,549. (No model.)

To Cb whom it may concern..-

Be it known that I, FRANK F. Looms, a citizen of the United States, and a resident of the city of Akron, in the county of Summit and State of Ohio, have invented a new and useful Improvement in Dynamo-Electric Machines and Oommutators, of which the following is a specification.

The objects of my invention are to reduce the number of parts and simplify the construction of the machine; to secure the effect of two compound-wound field-magnets by the use of ayoke wound with fine insulated wire connecting field-magnets wound with coarse insulated wire; to facilitate the winding of the armature-spools and enable them severally to be readily removed and replaced for repairs or other purposes; to provide a commutator simple in construction, perfectly insulated, and readily connected with the armature-wires, and, generally, to connect the several parts with the least use of bolts, rivets, or screws.

My invention consists in the devices illustrated in the accompanying drawings, as hereinafter described and claimed.

The aceompanyin drawings show, respectively, in Figure 1, one of the arrnature-rods, which constitutes a spool-core, unwound; Fi 2, the same with center spirally wound; Fig. 3, an end elevation of Fig. 2; Figs. at and 5, side and end elevations, respectively, of a complete armature-spool; Fig. (3, a side elevation of the armature-shaft and ends, showing the manner of retaining the spools; Figs. 7 and 8, the inner and outer faces, respect ively, of the armature ends; Fig. 9, a section of Fig. 7 at the line :0 03; Fig. 10, an elevation. of a complete machine, excepting the commutator, and the left field-magnet unwound; Fig. 11, a side elevation, enlarged, of commutator; and Figs. 12, 13, ll, 15, and 1?, details of the commutator on the same scale.

' Referring to the drawings substantially in their order, the armature-spools each consist of a soft-iron core, A, Fig. 1, with its central part of less diameter than the ends, and having its ends deeply recessed by longitudinal notches. The central part of said core is then wound with soft un insulated iron wire, a, until of equal diameter with the ends, the object of which is to add surface to the core. The whole is then wound longitudinally through the end notches with insulated wire, 13.

Upon the :u'mature-shaft C are two collars, l) I), from each of which PlTljOLl' radial arms (I d, which are attached to and support the annular disks E E, the outer faces of which are plain, their inner faces being provided with a series of cells, 6, for the rccepi ion of the ends of the cores A.

The ends of the cores A enter the cells c in each disk, and the disks are caused to approach each other and be retained by the nuts c on the shaft t, as shown in Fig. 5, in which two unwound. cores are shown.

The arnn'tturc thus constructed is mounted. in bearings f on the base F, which also supports the field-magnets G, each having a semicircular face conccntric with the armature and provided with a spool, g, wound with coarse insulated wire. Connecting the outer ends of the field-magnets G is a bar or yoke, H, the central part of which is also wound with a coil of fine insulated wire, 71.

Fpon one end of the shaft (7 is mounted the commutator l, which consists of a hollow cylinder, .l, Fig. 1 3, of glass or other non-conducting matcrial, on the periphery of which are placed lengthwise a series of bars, 1', each provided with a binding-post and having their outer faces cut away at each end, lcaw ing thin projecting ends.

A hard-rul ber ring j, with a radial flange, fits upon the thin ends of the bars 1, with the flange against the thicker shoulder. l'pon the ring-j is forced a metallic hoop, L, Fig. 12, which binds the ends of the bars firmly on the cylinder .T, and is retained by the nuts Zon the shaft C. The bars i are insulated from each other by a thin strip of non-conducting material, preferably mica. (Not shown in the drawings.)

The bars i correspond in number with the armature-spools, and each is connected by means of its landing-170st with the inner end of the insulated coil of one spool and the outer end of the coil of its adjacent spool.

The letter 1 indicates one of the commutator-brushes, which is secured to a post, K, connecting with the positive end of the line by means of a wire, 7;, and L the other commutator-brush, which is secured to a post, M, connected with one terminal of the coil g at the right of the machine by a wire, Z, the other terminal of said coil connecting by means of a wire, a, with one terminal of the coil g at the left of the machine, the other terminal of said coil connecting with the negative end of the line by a wire p. The terminals of the coil h of fine wire connect, respectively, with the positive end of the line by a wire, 4 and with the post M, carrying I the brush L, by means of a wire, .9, the current during the operation of the machine taking the direction shown by the arrows.

This construction enables me to wind each spool before it is placed in position and to disconnect it quickly and remove and replace it when necessary. by the use of the coil 71 on the yoke H, I secure for each field-magnet G the effect of a compound-wound magnet and reduce the size of the machine.

I claim 1. An armature for dynamo-electric generators, consisting of a number of spools, each having an iron center spirally wound with iron wire and longitudinally wound through recesses in its ends with insulated wire, mounted by devices, such substantially as shown, about a central shaft, substantially as and for the purpose hereinbefore set forth.

2. In an armature for dynamo-electric generators, the combination, with a number of electro-magnets, of two annular-disks mounted on a central shaft, having recesses in their adjacent faces in which the ends of said magnets rest, and screw-threaded nuts by which they are retained on said central shaft, substanti ally as shown, and for the purpose specivfied.

3. The combination, in an electric generator, of two electric field-magnets, g g, wound with coarse-wire series coils, the yoke H,wound with fine-wire shunt-coils, the brushes I and L and their supporting-posts, and the conductors I a, Z, ands, connecting the respective coils, the commutator I, and the rotating armature-spools B, the whole arranged to operate substantially as specified.

4. A commutator for dynamo-electric machines, consisting of a non-conducting cylinder, J, a series of conductingbars, 1', each provided with a bindingpost and insulated from each other by intermediate insulating material, the bars projecting beyond the ends of the cylinder and having their projecting ends cut away, the hard-rubber rings j, and the metallic hoops L, whereby the bars are bound firmly upon the cylinder, substantially as specified.

In testimony that I claim the foregoing I have hereunto set my hand this Qlth day of September, A. D. 1886.

FRANK F. LOOMIS.

Vitnesses:

O. P. HUMPHREY, G120. M. WRIGHT. 

